Hygiene File Core (Metal) A strong metal core for ultimate support while filing. The metal core is 100% disinfectant. The Bo. Hygiene File Core (Metal) is thin but strong and this means you get optimal results without applying too much pressure when filing. Features & Benefits Versatile use - for acrylic, gel and all other nail treatments Metal core – creates a sturdy base that prevents weakening or breakage during use Durable - excellent quality paper lightweight Easy to handle and clean Halfmoon shape - easy for around the cuticles Disposable files for optimum hygiene Available in different grits for every file type Usage Choose the grit or combination of grit files you wish to use during your treatment. Remove the paper from the hygiene refill. Place it on the metal or plastic core. Remove the sharp edges of the files by running the edges of the file along an old file. Halfmoon 100 grit Used for filing sidelines and free edges after product placement. Also suitable for removing old product during post-treatments. Halfmoon 150 grit Used for filing the nails into shape after product placement and for blending in the tips. Halfmoon 180 grit Used as part of the filing process. Eliminates deep grooves in the product before buffing. Suitable for filing on natural nails during nail preparation. Halfmoon 240 grit Perfect for shaping nails during competitions. Eliminates fine lines in the product before buffing. Suitable for filing on the natural nail during the manicure.